diff --git a/webapp/services/MailApiService.php b/webapp/services/MailApiService.php
index 9d569ea2..0989d860 100644
--- a/webapp/services/MailApiService.php
+++ b/webapp/services/MailApiService.php
@@ -15,7 +15,7 @@ class MailApiService extends BaseService {
       }
       ]
      */
-    public function sendSellMail($to, $content, $attachments)
+    public function sendSellMail($orderId, $to, $content, $attachments)
     {
 
     }
@@ -31,7 +31,7 @@ class MailApiService extends BaseService {
       }
       ]
      */
-    public function sendBuyMail($to, $content, $attachments)
+    public function sendBuyMail($orderId, $to, $content, $attachments)
     {
 
     }